1 // SPDX-License-Identifier: GPL-2.0
9  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
10  * 16-02-2012 pagemap extension by Al Viro
16 static unsigned qnx6_lfile_checksum(char *name, unsigned size)  in qnx6_lfile_checksum()  argument
19 	char *end = name + size;  in qnx6_lfile_checksum()
27 static struct page *qnx6_get_page(struct inode *dir, unsigned long n)  in qnx6_get_page()
29 	struct address_space *mapping = dir->i_mapping;  in qnx6_get_page()
30 	struct page *page = read_mapping_page(mapping, n, NULL);  in qnx6_get_page()  local
31 	if (!IS_ERR(page))  in qnx6_get_page()
32 		kmap(page);  in qnx6_get_page()
33 	return page;  in qnx6_get_page()
38 	unsigned long last_byte = inode->i_size;  in last_entry()
39 	last_byte -= page_nr << PAGE_SHIFT;  in last_entry()
47 					 struct page **p)  in qnx6_longname()
50 	u32 s = fs32_to_cpu(sbi, de->de_long_inode); /* in block units */  in qnx6_longname()
51 	u32 n = s >> (PAGE_SHIFT - sb->s_blocksize_bits); /* in pages */  in qnx6_longname()
52 	/* within page */  in qnx6_longname()
53 	u32 offs = (s << sb->s_blocksize_bits) & ~PAGE_MASK;  in qnx6_longname()
54 	struct address_space *mapping = sbi->longfile->i_mapping;  in qnx6_longname()
55 	struct page *page = read_mapping_page(mapping, n, NULL);  in qnx6_longname()  local
56 	if (IS_ERR(page))  in qnx6_longname()
57 		return ERR_CAST(page);  in qnx6_longname()
58 	kmap(*p = page);  in qnx6_longname()
59 	return (struct qnx6_long_filename *)(page_address(page) + offs);  in qnx6_longname()
68 	struct super_block *s = inode->i_sb;  in qnx6_dir_longfilename()
70 	struct page *page;  in qnx6_dir_longfilename()  local
73 	if (de->de_size != 0xff) {  in qnx6_dir_longfilename()
74 		/* error - long filename entries always have size 0xff  in qnx6_dir_longfilename()
76 		pr_err("invalid direntry size (%i).\n", de->de_size);  in qnx6_dir_longfilename()
79 	lf = qnx6_longname(s, de, &page);  in qnx6_dir_longfilename()
85 	lf_size = fs16_to_cpu(sbi, lf->lf_size);  in qnx6_dir_longfilename()
88 		pr_debug("file %s\n", lf->lf_fname);  in qnx6_dir_longfilename()
90 		qnx6_put_page(page);  in qnx6_dir_longfilename()
96 	if (!test_opt(s, MMI_FS) && fs32_to_cpu(sbi, de->de_checksum) !=  in qnx6_dir_longfilename()
97 			qnx6_lfile_checksum(lf->lf_fname, lf_size))  in qnx6_dir_longfilename()
101 		 lf_size, lf->lf_fname, de_inode);  in qnx6_dir_longfilename()
102 	if (!dir_emit(ctx, lf->lf_fname, lf_size, de_inode, DT_UNKNOWN)) {  in qnx6_dir_longfilename()
103 		qnx6_put_page(page);  in qnx6_dir_longfilename()
107 	qnx6_put_page(page);  in qnx6_dir_longfilename()
115 	struct super_block *s = inode->i_sb;  in qnx6_readdir()
117 	loff_t pos = ctx->pos & ~(QNX6_DIR_ENTRY_SIZE - 1);  in qnx6_readdir()
123 	ctx->pos = pos;  in qnx6_readdir()
124 	if (ctx->pos >= inode->i_size)  in qnx6_readdir()
128 		struct page *page = qnx6_get_page(inode, n);  in qnx6_readdir()  local
133 		if (IS_ERR(page)) {  in qnx6_readdir()
135 			ctx->pos = (n + 1) << PAGE_SHIFT;  in qnx6_readdir()
136 			return PTR_ERR(page);  in qnx6_readdir()
138 		de = ((struct qnx6_dir_entry *)page_address(page)) + start;  in qnx6_readdir()
139 		for (; i < limit; i++, de++, ctx->pos += QNX6_DIR_ENTRY_SIZE) {  in qnx6_readdir()
140 			int size = de->de_size;  in qnx6_readdir()  local
141 			u32 no_inode = fs32_to_cpu(sbi, de->de_inode);  in qnx6_readdir()
143 			if (!no_inode || !size)  in qnx6_readdir()
146 			if (size > QNX6_SHORT_NAME_MAX) {  in qnx6_readdir()
158 					 __func__, size, de->de_fname,  in qnx6_readdir()
160 				if (!dir_emit(ctx, de->de_fname, size,  in qnx6_readdir()
167 		qnx6_put_page(page);  in qnx6_readdir()
178 	struct super_block *s = dir->i_sb;  in qnx6_long_match()
180 	struct page *page;  in qnx6_long_match()  local
182 	struct qnx6_long_filename *lf = qnx6_longname(s, de, &page);  in qnx6_long_match()
187 	thislen = fs16_to_cpu(sbi, lf->lf_size);  in qnx6_long_match()
189 		qnx6_put_page(page);  in qnx6_long_match()
192 	if (memcmp(name, lf->lf_fname, len) == 0) {  in qnx6_long_match()
193 		qnx6_put_page(page);  in qnx6_long_match()
194 		return fs32_to_cpu(sbi, de->de_inode);  in qnx6_long_match()
196 	qnx6_put_page(page);  in qnx6_long_match()
207 	if (memcmp(name, de->de_fname, len) == 0)  in qnx6_match()
208 		return fs32_to_cpu(sbi, de->de_inode);  in qnx6_match()
214 			 struct page **res_page)  in qnx6_find_entry()
216 	struct super_block *s = dir->i_sb;  in qnx6_find_entry()
218 	struct page *page = NULL;  in qnx6_find_entry()  local
229 	start = ei->i_dir_start_lookup;  in qnx6_find_entry()
235 		page = qnx6_get_page(dir, n);  in qnx6_find_entry()
236 		if (!IS_ERR(page)) {  in qnx6_find_entry()
240 			de = (struct qnx6_dir_entry *)page_address(page);  in qnx6_find_entry()
244 					if (len != de->de_size)  in qnx6_find_entry()
249 				} else if (de->de_size == 0xff) {  in qnx6_find_entry()
257 					pr_err("undefined filename size in inode.\n");  in qnx6_find_entry()
259 			qnx6_put_page(page);  in qnx6_find_entry()
268 	*res_page = page;  in qnx6_find_entry()
269 	ei->i_dir_start_lookup = n;  in qnx6_find_entry()